Optical: systems and elements – Lens – With variable magnification
Patent
1997-10-07
1999-01-26
Epps, Georgia
Optical: systems and elements
Lens
With variable magnification
359691, 359717, 359795, G02B 1514, G02B 302, G02B 904
Patent
active
058644350
ABSTRACT:
In a compact wide-angle zoom lens having a two-group configuration composed of positive and negative lens groups, each lens is set to have a predetermined form and satisfy a predetermined range of conditional expression, thereby attaining a high brightness at its wide-angle end, a large angle of view, and a small lens thickness at its telephoto end. The first lens group comprises a biconcave negative first lens L.sub.1 ; a cemented lens composed of a negative second lens L.sub.2 and a biconvex positive third lens L.sub.3 ; and a biconvex positive fourth lens L.sub.4. The second lens group comprises a fifth lens L.sub.5 having an aspheric surface; a sixth lens L.sub.6 having a positive meniscus form with a convex surface directed onto the image side; and a seventh lens L.sub.7 having a negative meniscus form with a convex surface directed onto the image side. The zoom lens further satisfies the following conditional expressions:
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Epps Georgia
Fuji Photo Optical Co., Ltd.
Lester Evelyn A.
Snider Ronald R.
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